docs(huntsman): Add user-doc scaffolding.

[LinZhihao-723]

Description

This PR adds the scaffolding for Huntsman's user doc, including a deployment guide template and a configuration guide template.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• Ensure all workflows pass.

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[LinZhihao-723]

@sitaowang1998 @20001020ycx Please check the scaffolding since we three need to work together to fill these pages in the coming PRs.

[LinZhihao-723]

I will be responsible for filling this section.

[LinZhihao-723]

@sitaowang1998 You should work on this section in a future PR.

[LinZhihao-723]

@20001020ycx You should work on this section in a future PR.